John Loudon
John Loudon is the name of the following people:
- John Claudius Loudon (1783–1843), Scottish botanist and landscape architect
- John Loudon (politician) (1866–1955), Dutch Foreign Minister (1913–1918)
- John H. Loudon (1905–1996), Chairman of the Board of Directors of Royal Dutch Shell, President of WWF international
See also:
- John Loudon McAdam (1756–1836), Scottish inventor
